Question

explain the method of finding the focal length of a concave mirror​

Answer 1

Answer:

f = focal length

r = radius of curvature

f = r/2

Explanation:

we have a formula f = r/2

it says that focal length is half of radius of curvature

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Answer 2

Answer:

first expose is beam of light and make the point size image and measure the distance between lens and image ... that is ur focal lenght........................